3) ASL PRO: (Diversity Tool)
This page is a good reference that contains a video dictionary of ASL words and phrases. Users can select from different categories, search for phrases or even single words. The signs are performed on video and you can pause them to analyze the specific motions. The video format makes the signs easy to learn.

ASL can be used in the classroom as a kinesthetic modality, or to help incorporate Deaf and hard of hearing students. I like to partner signs with songs for younger kids. Signs also provide another point of access for ELL students. Beyond that, signs are just a fun way to liven up lectures and group time.